20775964 has 24 divisors (see below), whose sum is σ = 39942000. Its totient is φ = 9377280.

The previous prime is 20775961. The next prime is 20775991. The reversal of 20775964 is 46957702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4972 + ... + 8140.

It is an arithmetic number, because the mean of its divisors is an integer number (1664250).

Almost surely, 2^20775964 is an apocalyptic number.

It is an amenable number.

20775964 is a deficient number, since it is larger than the sum of its proper divisors (19166036).

20775964 is a wasteful number, since it uses less digits than its factorization.

20775964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333 (or 3331 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 20775964 is about 4558.0658178662. The cubic root of 20775964 is about 274.9077993939.

The spelling of 20775964 in words is "twenty million, seven hundred seventy-five thousand, nine hundred sixty-four".